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If n (A) = 15, n (A È B ) = 29, n (A Ç B) = 7 then n (B) = ?

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If n (A) = 15, n (A È B ) = 29, n (A Ç B) = 7 then n (B) = ?

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We have,

n (A) = 15, n (A ∪ B ) = 29, n (A ∩ B) = 7 

Since, n (B) = n (A ∪ B ) + n (A ∩  B) - n (A) = 29 + 7 - 15

So, n (B) = 21

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